APA ציטוט

Schumann, W. (1997). Gemstones of the world (Rev. & expanded ed.). Sterling Pub.

Chicago Style (17th ed.) Citation

Schumann, Walter. Gemstones of the World. Rev. & expanded ed. New York: Sterling Pub, 1997.

ציטוט MLA

Schumann, Walter. Gemstones of the World. Rev. & expanded ed. Sterling Pub, 1997.